"A prestigious scientific journal Wednesday took the unusual step of retracting some high-profile research that had generated international excitement about stem cell research."

"The British scientific journal Nature retracted two papers published in January by scientists at the Riken research institute in Japan and at Harvard Medical School that claimed that they could create stem cells simply by dipping skin and blood cells into acid."

"The claim raised the possibility of being able to use the cells to easily make any kind of cell in the body to treat many diseases and generated international media coverage, including some on Shots."